"Maybe it is not quite as bad as we think but it looks as though he is going to be facing some time out, but we don't know how long at this point.

"He will have a scan once we have travelled back, he has had an initial ultrasound which showed some damage to the knee but we are not exactly sure how bad it is."

Should Bartley be ruled out for the long term it could have an impact on Swansea's business during the final days of the summer transfer window.

Clement has spoken of wanting two players for every position, and an extended absence for Bartley would leave him with only three centre-halves in his first-team squad in the form of Alfie Mawson Federico Fernandez and Mike van der Hoorn.